Given a domain A in xyz space and a function f ( x , y , z ) defined on A , the integral of function f over domain A with respect to volume element dV = dxdydz in space is called a volume integral, and is written as . A volume integral is essentially a normal integral in a spatial domain, but it is a term used in correspondence with the terms line integral and surface integral. In physical terms, the mass of an object A with density distribution f ( x , y , z ) is given by, and the x coordinate of the center of gravity of that object is given by (the same is true for the y and z coordinates of the center of gravity). Source: Heibonsha World Encyclopedia, 2nd Edition Information |
xyz空間における領域Aと,Aで定義された関数f(x,y,z)があるとき,空間における体積要素dV=dxdydzに関する関数fの領域Aにおける積分を体積分と呼び,と書く。体積分とは要するに空間領域における通常の積分であるが,線積分や面積分ということばに対応して使われることばである。物理的には,密度分布f(x,y,z)をもつ物体Aの質量がであり,その物体の重心のx座標は,で与えられる(重心のy座標,z座標についても同様である)。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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